KR101207310B1 - Estimation method on power generation performance of grid-connected photovoltaic system And Apparatus Thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for estimating power generation performance of a grid-connected photovoltaic power generation system, the method comprising calculating and converting DC power, AC power, and solar intensity values of the photovoltaic power generation system into equivalent operating time, and photovoltaic power generation. Estimating an equivalent operating time (Y _{AT, Esti} ) after temperature correction of the array, and based on the estimated operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after the estimated temperature correction. solar equivalent operation of the power array time (Y _{a, Esti)} the equivalent running time of the photovoltaic power system from the estimated phase, and the estimated solar power equivalent running time of the array (Y _{a, Esti)} to (Y _{P, Estim} ) and _{comparing the difference} between the estimated operating time (Y _{A, Esti} ) of the photovoltaic array and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system and the actual output value. And, the difference value is set in advance If it exceeds, it characterized in that it comprises the step of estimating the power generation performance by re-calculating the model coefficients.
According to the present invention, it is possible to estimate the power generation performance of the photovoltaic power generation system irrespective of the installed capacity according to changes in the surrounding environment such as solar radiation intensity, temperature and wind speed, so that the performance improvement through the loss reduction of the photovoltaic power generation system, and the purpose of use Customized design optimized to meet the requirements of long-term reliability and stability performance and quality is possible.

Description

Estimation method on power generation performance of grid-connected photovoltaic system And Apparatus Thereof}

The present invention relates to a method for estimating power generation performance of a grid-connected photovoltaic system. More particularly, the present invention relates to a method for estimating the generation of a photovoltaic system against changes in the surrounding environment such as insolation intensity, temperature, and wind speed by applying an equivalent operating time concept. By estimating the power generation performance, it is possible to provide information that can more quickly and easily determine whether there is an abnormality due to a performance failure, failure or defect of a photovoltaic system regardless of the installed capacity. The present invention relates to a method for estimating power generation performance of a grid-connected photovoltaic system having versatility and utility.

The grid-connected photovoltaic system consists of a photovoltaic array that converts the input energy of solar radiation into a DC output and a photovoltaic inverter that converts the DC output of the photovoltaic array into an AC output. The power generation system is not always constant and constantly changes depending on the changes in the surrounding environment such as solar intensity, temperature and wind speed, as well as the performance of the photovoltaic module, the photovoltaic array and the photovoltaic inverter. Therefore, the generation performance of photovoltaic modules and photovoltaic arrays under standard test conditions (STC), solar radiation intensity of 1kW / m ² , surface temperature of photovoltaic modules at 25 ^o C and AM (air mass) 1.5 It is difficult to estimate the generation performance such as the output value of the actual photovoltaic system only with basic information such as the generation performance of the photovoltaic inverter under the over-rated condition.

In recent years, installation and dissemination of various photovoltaic power generation systems is rapidly expanding, but technologies such as optimization of photovoltaic power generation system, post-operation management, and maintenance inspection are still in the initial stage. Management and maintenance inspections are not carried out.

In addition, the photovoltaic power generation system can be installed in a variety of installation capacity of several tens of Watts to several tens of megawatts, so it is necessary to evaluate the normalized performance irrespective of the installed capacity, conventionally, only power generation analysis, operation, etc. It is possible to grasp only the current status, and also in the performance evaluation, the abnormality of serious failure or defect through simple comparison based on the result of measuring current and voltage characteristics of individual series circuits using the performance diagnostic equipment of the photovoltaic array. It is difficult to determine whether there is an abnormality caused by micro-failures such as long-term performance degradation and defects of the photovoltaic system according to changes in the surrounding environment.

The photovoltaic system has a long lifespan compared to other renewable energy sources and requires little maintenance.However, shade, pollution and deterioration in the photovoltaic array, failure of the photovoltaic inverter, degradation of performance and photovoltaic Due to defects in the design and construction of the power generation system, the power generation performance expected at the initial design often does not come out.

Until now, we have compared and analyzed the power generation performance by calculating the performance ratio (PR), which is the performance index of the photovoltaic power generation system. There is a problem that it is difficult to accurately determine whether there is an abnormality such as a failure or a defect.

Regardless of the installed capacity, if the power generation performance of the photovoltaic system is not estimated to provide the necessary information to quickly and easily determine the long-term performance degradation, failure or defect, etc. Since reliability and stability cannot be established, it cannot be said that it is a true eco-friendly energy source.

Therefore, it provides the necessary information to quickly and easily determine whether there is an abnormality such as a degradation of the photovoltaic system, a failure or a defect, and thus can guarantee the performance and quality of the photovoltaic system for a long time. In order to maintain the maximum performance until the end, there is an urgent need for a technology that can estimate the power generation performance of the photovoltaic system irrespective of the installed capacity.

The present invention has been made to solve the above problems, an object of the present invention is to use the equivalent operating time calculated from the operation data of the grid-connected photovoltaic system using power generation performance such as output value of the Taeang photovoltaic system. By estimating the installed capacity, it is possible to provide information necessary to more easily and quickly determine whether there is an abnormality such as deterioration, failure or defect of the photovoltaic system regardless of the installed capacity. It is to maintain the maximum performance at all times while improving energy use efficiency and establishing efficient and systematic follow-up management technology.

According to an aspect of the present invention for achieving the above object, the step of calculating by converting the DC power, AC power and insolation intensity values of the photovoltaic power generation system into equivalent operating time, and after the temperature correction of the photovoltaic array Estimating an equivalent operating time (Y _{AT, Esti} ), and based on the estimated operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after the estimated temperature correction. Estimating an equivalent operating time (Y _{A, Esti} ), and estimating an equivalent operating time (Y _{P, Esti} ) of the photovoltaic system from the estimated operating time (Y _{A, Esti} ) of the photovoltaic array. Comparing the difference between the estimated equivalent operating time (Y _{A, Esti} ) of the photovoltaic array and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system and the actual output value, and the difference value If this exceeds the preset criteria, the model The grid-connected power generation performance estimation method for a photovoltaic generation system to re-calculate the number comprising the steps of estimating the power generation performance is provided.

According to another aspect of the present invention for achieving the above object, a performance database for collecting operating data including the output value, solar radiation intensity, temperature, wind speed of the photovoltaic power generation system, from the operating data collected in the performance database The DC power, AC power, and solar intensity values of the photovoltaic system are determined by the solar equivalent uptime (Y _R ), the equivalent uptime (Y _{A, Meas} ) of the photovoltaic array, and the equivalent uptime (Y) of the photovoltaic system, respectively. _{P, Meas)} by transformation, according to the power generation performance estimation, set the period to estimate the power generation performance by using the converted equivalent running time estimate that displays information about the power generation performance estimation value and the output value of the solar power system result display And a memory configured to store information about the collected driving data and the estimated value and the output value of the estimated result display unit. Is the grid-connected power generation performance of the solar power estimator system is provided.

According to the present invention, it is possible to estimate the power generation performance of the photovoltaic power generation system irrespective of the installed capacity according to changes in the surrounding environment such as solar radiation intensity, temperature and wind speed, so that the performance improvement through the loss reduction of the photovoltaic power generation system, and the purpose of use Customized design optimized to meet the requirements of long-term reliability and stability performance and quality is possible.

In addition, the present invention does not examine the operation status of the power generation status, operation status, etc. of the photovoltaic power generation system, but by monitoring the current operation status in real time and comparing the estimated value and the output value using the performance estimation model, the photovoltaic power generation system It is possible to apply it to the development of new photovoltaic technology such as fault detection and diagnosis technology that can be operated at maximum performance without failure or failure due to the end of life.

In addition, the present invention can monitor the operation status of the photovoltaic power generation system in real time to detect and diagnose in advance whether there is an abnormality, such as performance degradation, failure or defect, and can quickly provide useful information to the user or operator, photovoltaic power generation The loss of the system can be minimized and economic costs such as power generation cost and maintenance can be reduced.

1 is a block diagram of a power generation performance estimation apparatus of a photovoltaic system according to a preferred embodiment of the present invention.
2 is a flowchart of a method for estimating power generation performance of a photovoltaic system according to a preferred embodiment of the present invention.
Figure 3 is a graph showing the results of the estimation of the fractional power generation performance of the photovoltaic system calculated by the power generation performance estimation method according to an embodiment of the present invention.
FIG. 4 is a graph showing the estimated power generation performance and the output value for each fraction of the photovoltaic power generation system calculated by the power generation performance estimation method according to the preferred embodiment of the present invention.
5 is a graph illustrating power generation performance estimation values and output values for every 15 minutes of the photovoltaic power generation system calculated by the power generation performance estimation method according to an exemplary embodiment of the present invention.
FIG. 6 is a graph showing power generation performance estimation values and output values for every 30 minutes of the photovoltaic system calculated by the power generation performance estimation method according to an exemplary embodiment of the present invention.
FIG. 7 is a graph showing power generation performance estimation values and output values for each hour of the photovoltaic system calculated by the power generation performance estimation method according to an exemplary embodiment of the present invention.
8 is a graph illustrating daily power generation performance estimation values and output values of the photovoltaic power generation system calculated by the power generation performance estimation method according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a block diagram of a power generation performance estimation apparatus of a photovoltaic system according to a preferred embodiment of the present invention.

Referring to FIG. 1, the apparatus for estimating power generation performance of a grid-connected photovoltaic power generation system according to the present invention includes a performance database 100 for collecting operation data such as an output value, solar radiation intensity, temperature, and wind speed of a photovoltaic power generation system; Estimation result showing the power generation performance estimator 200 for estimating the power generation performance of the photovoltaic system through the method of estimating power generation performance using the equivalent operating time from the performance database 100, and the estimated value and the output value according to the set period. The display unit 300 includes a memory 400 for storing information about the operation data of the performance database 100 and the estimated value and the output value of the estimation result display unit 300.

Here, the performance database 100 collects every minute, every 15 minutes, every 30 minutes and every hour by measuring the operation data such as output value, solar intensity, temperature and wind speed of the photovoltaic system at a sampling cycle every 1 second. It is preferable.

Detailed processing operations of the power generation performance estimation unit 200 will be described in detail with reference to FIG. 2.

2 is a flowchart of a method for estimating power generation performance of a grid-connected photovoltaic system according to a preferred embodiment of the present invention.

First, the equivalent operating time (Y _R ), equivalent operating time (Y _{A, Meas} ) of the photovoltaic array, and equivalent operation of the photovoltaic system are calculated using the DC power, AC power, and solar intensity values obtained through the performance database 100. Convert to time Y _{P, Esti} (S4).

The DC power, AC power, and solar intensity values of the photovoltaic power generation system are calculated by the following equation (1), every 15 minutes, every 30 minutes, and hourly solar equivalent operating hours (Y _R ), and equivalent operation of the solar array. It is calculated as the time Y _{A, Meas} and the equivalent operating time Y _{P, Measi} of the photovoltaic system.

Where Y _R : solar equivalent uptime

G _{A , Meas} : Slope insolation of slope [W / m ² ]

G _{A , Ref} : Insolation intensity 1,000 [W / m ² ]

Y _{A , Meas} : PV array equivalent uptime output

Y _{P , Meas} : Equivalent operation time output value of PV system

P _{A , Meas} : PV array output [W]

P _{P , Meas} : PV system output [W]

P _AS : PV array installed capacity under standard test conditions (STC) [W]

T _min : time interval in minutes

When the equivalent operating time is calculated, the equivalent operating time (Y _AT) after the temperature correction of the photovoltaic array is corrected from the solar equivalent operating time (Y _R ) to the surface temperature of 25 ^o C of the photovoltaic array, which is the standard test condition (STC). _{, Esti} ) is estimated (S6).

Equivalent operating time (Y _{AT, Esti} ) after the temperature correction of the solar array every minute, every 15 minutes, every 30 minutes and every hour from the solar equivalent operating time (Y _R ) calculated through Equation 1 is We estimate by 2.

Where Y _{AT , Esti} : Equivalent running time estimate after PV array temperature calibration

A _at and B _at : PV array temperature correction constant (surface temperature of PV module 25 ^o C)

η _a : Photovoltaic Array Aging Factor

η _an : Photovoltaic Array Aging Coefficient by Year of Operation

n : years of operation

T _min : time interval in minutes

It is determined from the operation data of the performance database 100 whether the surface temperature (T _m ) of the photovoltaic module is present (S8), and as a result, if the surface temperature (T _m ) of the photovoltaic module does not exist, the outside temperature The surface temperature T _m of the photovoltaic module is estimated from operation data such as degrees and wind speeds (S10).

Surface temperature (T _m ) of the photovoltaic module every minute, every 15 minutes, every 30 minutes, and every hour from operating data such as temperature and wind speed of the performance database 100 is the following equation By Equation 3, when the outside air temperature and wind speed information exist, it is estimated by the following equation (4).

Where T _m : surface temperature of photovoltaic module ( ^o C)

T _a : Ambient temperature ( ^o C)

α _tm : PV module temperature correction coefficient

Y _R : solar equivalent uptime

A _m : PV module temperature compensation constant

T _min : Time interval in minutes

Where T _m : surface temperature of photovoltaic module ( ^o C)

T _a : Ambient temperature ( ^o C)

α _tm : PV module temperature correction coefficient

V _w : Wind speed (m / s)

A _m : PV module temperature compensation constant

T _min : time interval in minutes

Once the surface temperature (T _m ) of the photovoltaic module is determined, it is determined every 15 _minutes and every 15 minutes from the equivalent operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after temperature compensation of the photovoltaic array. Equivalent operating time (Y _{A, Esti} ) of the photovoltaic array every 30 minutes and every hour is estimated by Equation 5 below (S12).

Where Y _{A , Esti} : Equivalent running time estimate of the PV array

α _t : PV array temperature correction coefficient (surface temperature of PV module 25 ^o C)

A _t : PV array temperature correction constant

T _m : Surface temperature of photovoltaic module ( ^o C)

T _min : time interval in minutes

Once the equivalent uptime (Y _{A, Esti} ) of the photovoltaic array is estimated, the solar power generation system is estimated every _minute , every 15 _minutes , every 30 _minutes , and every hour from the equivalent uptime (Y _{A, Esti} ) of the photovoltaic array. Equivalent operating time (Y _{P, Esti} ) of is estimated by the following equation (S14).

Where Y _{P , Esti} : PV system equivalent uptime estimate

A _p , B _p and C _p : PV power output correction coefficient

T _min : time interval in minutes

The estimated values of the equivalent operating time (Y _{A, Esti} ) of the photovoltaic array (Y _{A, Esti} ) and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system estimated by the equations (5) and (6) are the solar equivalent operating time (Y _R ) _A comparison decision is made based on Equation 7 to determine whether the equivalent operating time Y _{A, Meas} of the photovoltaic array and the output value of the equivalent operating time Y _{P, Meas} of the photovoltaic system are close to 0.3 or more. (S16).

here,

Err _A : Equal Uptime Difference Value of PV Array

Err _P : Equal Uptime Difference Value of PV System

Y _{A , Esti} : _Estimated PV Uptime Equivalent Uptime

Y _{A , Meas} : PV array equivalent uptime output value

Y _{P , Esti} : Estimated equivalent operation time of photovoltaic system

Y _{P , Meas} : PV array equivalent uptime output value

Y _R : Solar equivalent uptime

As a result of the comparison judgment in S16, when the estimated value is not close to the output value, the photovoltaic array aging coefficient ( η _a ), which is the model coefficient of the power generation performance estimation unit 200, the photovoltaic array temperature correction constants ( A _at and B _at) ), The photovoltaic module temperature correction coefficient ( a _tm ) and the photovoltaic array temperature correction coefficient ( a _t ) are recalculated to estimate power generation performance (S18).

3 is a graph showing the results of estimating the power generation performance of the grid-connected photovoltaic system every minute using Equations 1 to 6 according to a preferred embodiment of the present invention.

4 is a solar equivalent operating time (Y _R ), the equivalent operating time (Y _{A, Esti} ) and solar of the photovoltaic array using Equations 1, 5 and 6 according to a preferred embodiment of the present invention. The estimated value of the equivalent operating time of the photovoltaic system (Y _{P, Esti} ), the equivalent operating time of the photovoltaic array (Y _{A, Meas} ), and the output value of the equivalent operating time (Y _{P, Meas} ) of the photovoltaic system This is a graph.

5 is a solar equivalent operating time (Y _R ), the equivalent operating time (Y _{A, Esti} ) and solar of the solar array using Equations 1, 5 and 6 according to a preferred embodiment of the present invention Estimate the equivalent operating time of the photovoltaic system (Y _{P, Esti} ), the equivalent operating time of the photovoltaic array (Y _{A, Meas} ), and the output value of the equivalent operating time (Y _{P, Meas} ) of the photovoltaic system. The graph is shown by minute.

6 is a solar equivalent operating time (Y _R ), the equivalent operating time (Y _{A, Esti} ) and solar of the photovoltaic array using Equations 1, 5 and 6 according to a preferred embodiment of the present invention. The estimated value of the equivalent operating time of the photovoltaic system (Y _{P, Esti} ), the equivalent operating time of the photovoltaic array (Y _{A, Meas} ) and the output value of the equivalent operating time (Y _{P, Meas} ) of the photovoltaic system The graph is shown by minute.

7 is a solar equivalent operating time (Y _R ), the equivalent operating time (Y _{A, Esti} ) and solar of the solar array using Equations 1, 5 and 6 according to a preferred embodiment of the present invention The estimated value of the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system, the equivalent operating time (Y _{A, Meas} ) of the photovoltaic array and the output value of the equivalent operating time (Y _{P, Meas} ) of the photovoltaic system This is a graph.

8 is a solar equivalent operating time (Y _R ), the equivalent operating time (Y _{A, Esti} ) and solar of the photovoltaic array using Equations 1, 5 and 6 according to a preferred embodiment of the present invention. Estimates of equivalent operating hours (Y _{P, Esti} ) of photovoltaic systems, equivalent operating times (Y _{A, Meas} ) of solar arrays, and output values of equivalent operating times (Y _{P, Meas} ) of photovoltaic systems This is a graph.

The generation performance estimation unit 200 performs an equivalent operation time (Y _{AT, Esti} ), an equivalent operation time (Y _{A, Esti} ) of the photovoltaic _array , and an equivalent operation of the photovoltaic system after temperature correction of the photovoltaic array for each hour. From the time (Y _{P, Esti} ) it is possible to estimate the power generation performance by daily, monthly and year through the following equations (8) to (10).

_Here, Y _{ATt, Esti:} PV array temperature equivalent running time estimation value after correction

Y _{A , Esti} : _Estimated PV Uptime Equivalent Uptime

Y _{P , Esti} : Estimated equivalent operation time of photovoltaic system

d : number of driving days

100: performance database 200: power generation performance estimation unit
300: estimation result display unit 400: memory

Claims (12)

Calculating the DC power, AC power, and insolation intensity values of the photovoltaic system by converting them into equivalent operating time;
Estimating an equivalent operating time (Y _{AT, Esti} ) after temperature correction of the photovoltaic array;
Estimating the equivalent operating time (Y _{A, Esti} ) of the photovoltaic array based on the equivalent operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after the estimated temperature correction;
Estimating an equivalent operating time (Y _{P, Esti} ) of the photovoltaic system from the estimated operating time (Y _{A, Esti} ) of the photovoltaic array;
Comparing the difference between the estimated operating time (Y _{A, Esti} ) and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system and the actual output value, the difference value (Err _A , Err _P ) Calculating a;
Estimating power generation performance by recalculating a model coefficient when the difference value exceeds a preset criterion;
The step of converting the DC power, AC power and insolation intensity values of the photovoltaic power generation system into equivalent operating time may include calculating a plurality of preset time intervals of the DC power, AC power and insolation intensity of the photovoltaic power generation system from operation data. In accordance with Equation 1 below, the solar equivalent operating time Y _R , the equivalent operating time Y _{A and Meas} of the photovoltaic array, and the equivalent operating time Y _{P and Measi} of the photovoltaic system are calculated. Method for estimating power generation performance of grid-connected photovoltaic power generation system.
Equation 1.

,

,

Where Y _R : solar equivalent uptime
G _{A, Meas} : Slope insolation of slope [W / m ² ]
G _{A, Ref} : Insolation intensity 1,000 [W / m ² ]
Y _{A, Meas} : PV array equivalent uptime output value
Y _{P, Meas} : Equivalent operation time output value of PV system
P _{A, Meas} : PV array output [W]
P _{P, Meas} : PV system output [W]
P _AS : PV array installed capacity under standard test conditions (STC) [W]
T _min : time interval (minutes) delete The method of claim 1,
After estimating the temperature of the photovoltaic array, estimating the equivalent operating time (Y _{AT, Esti} ),
The equivalent operating time (Y _{AT, Esti} ) after the temperature correction of the photovoltaic array corrected from the solar equivalent operating time (Y _R ) to the surface temperature of 25 ^o C of the photovoltaic array, which is the standard test condition (STC) A method for estimating power generation performance of a grid-tied photovoltaic system, characterized in that the estimation is performed for each predetermined time interval by an equation.
Equation 2.

Where Y _{AT , Esti} : Equivalent running time estimate after PV array temperature calibration
A _at and B _at : Photovoltaic Array Temperature Correction Factor (Photovoltaic Module Surface Temperature 25 ^o C)
η _a : PV array aging coefficient (0.8-1.0)
η _an : Photovoltaic Array Aging Factor by Year of Operation (1-30)
n : years of operation (1-30)
T _min : time interval in minutes The method of claim 1,
Estimating the surface temperature T _m of the photovoltaic module from operation data including at least one of an outside temperature and a wind speed when the surface temperature T _m of the photovoltaic module does not exist. A method for estimating power generation performance of a grid-connected photovoltaic system. The method of claim 4, wherein
Estimating the surface temperature (T _m ) of the photovoltaic module from the operation data including at least one of the outside air temperature and the wind speed
When only the outside air temperature data is present by the following equation 3, when the outside air temperature and wind speed data is characterized by estimating the surface temperature (T _m ) of the photovoltaic module for each predetermined time interval by the following equation (4) Estimation method of power generation performance of grid-connected photovoltaic power generation system.
Equation 3.

Where T _m : surface temperature of photovoltaic module ( ^o C)
T _a : Ambient temperature ( ^o C)
α _tm : PV module temperature correction coefficient (20 ~ 50)
Y _R : solar equivalent uptime
A _m : PV module temperature correction constant (-3.0? 3.0)
T _min : time interval in minutes


Equation 4.

Where T _m : surface temperature of photovoltaic module ( ^o C)
T _a : Ambient temperature ( ^o C)
α _tm : PV module temperature correction coefficient (20 ~ 50)
V _w : Wind speed (m / s)
B _m : PV module temperature correction constant (-1.0? 1.0)
T _min : time interval in minutes The method of claim 1,
Estimate the equivalent operating time (Y _{A, Esti} ) of the photovoltaic array based on the equivalent operating time (Y _{AT, Esti} ) and the surface temperature (T _m ) of the photovoltaic module after the estimated temperature correction,
A method for estimating power generation performance of a grid-connected photovoltaic power generation system, characterized in that it is estimated for each predetermined time interval by Equation 5 below.
Equation 5.

Where Y _{A , Esti} : PV array equivalent uptime estimate
α _t : PV array temperature correction coefficient (-0.01? -0.001)
A _t : PV array temperature correction constant (-0.05? 0.05)
T _m : Surface temperature of photovoltaic module ( ^o C)
T _min : time interval (minutes) The method of claim 1,
Estimating the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system from the estimated operating time (Y _{A, Esti} ) of the photovoltaic array
Estimating power generation performance of a grid-connected photovoltaic system, characterized in that to estimate the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system for each time interval set in advance by the following equation (6).
Equation 6.

Where Y _{P , Esti} : PV system equivalent uptime estimate
Y _{A , Esti} : _Estimated PV Uptime Equivalent Uptime
A _P , B _P and C _P : PV system output correction factor
T _min : time interval (minutes) The method of claim 1,
_Comparing the difference between the estimated operating time (Y _{A, Esti} ) and the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system and the actual output value
By using Equation 7, the equivalent operation time (Y _{A, Esti} ) of the photovoltaic array and the equivalent operation time (Y _{P, Esti} ) of the photovoltaic system when the solar equivalent operating time (Y _R ) is 0.3 or more. _A grid-connected photovoltaic power generation comprising comparing and determining a difference between an estimated value of an output value of an equivalent operating time (Y _{A, Meas} ) of a photovoltaic array and an equivalent operating time (Y _{P, Meas} ) of a photovoltaic system. Method of estimating power generation performance of system.
Equation 7.

,

Where Err _A : PV array equivalent operating time difference (0.05 or less)
Err _P : Equivalent operation time difference value of PV system (0.05 or less)
Y _{A, Esti} : PV array equivalent uptime estimate
Y _{A, Meas} : PV array equivalent uptime output value
Y _{P, Esti} : Estimated equivalent operation time of solar power system
Y _PMeas : Equivalent operation time output value of PV system
Y _R : solar equivalent uptime The method of claim 1,
Equivalent operating time (Y _{AT, Esti} ), equivalent operating time (Y _{A, Esti} ) of the photovoltaic array after the temperature correction of the plurality of preset time intervals of the photovoltaic array and the equivalent operating time of the photovoltaic system ( Y _{P, Esti} ) power generation performance estimation method of the grid-connected photovoltaic system, characterized in that for estimating the power generation performance every day, every month and year through the following equation (8) to (10).
Equation 8.

Equation 9.

Equation 10.

Where Y _{ATt, Esti} : Equivalent running time estimate after photovoltaic array temperature correction
Y _{A, Esti} : PV array equivalent uptime estimate
Y _{P, Esti} : Estimated equivalent operation time of solar power system
d : number of driving days The method of claim 1,
If the difference value exceeds a preset criterion, recalculating the model coefficient to estimate power generation performance
The photovoltaic array aging coefficient ( η _a ), the photovoltaic array temperature correction coefficients ( A _at and B _at ), the photovoltaic module temperature correction coefficient ( a _tm) ), PV array, temperature correction coefficient (a _t generation performance estimation method for a grid-interactive photovoltaic generation system, comprising a step of estimating the power generation performance) to re-calculate. A performance database for collecting operational data including power output, solar intensity, temperature and wind speed of the solar power system;
From the operating data collected in the performance database, the direct current, alternating current and solar intensity values of the photovoltaic system can be determined by the solar equivalent uptime (Y _R ), the equivalent uptime (Y _{A, Meas} ) of the photovoltaic array, and the solar, respectively. equivalent running time of the power generation system (Y _{P, Meas)} by transformation, the equivalent running time after the temperature compensation of the PV array (Y _{AT, Esti)} estimation, and the equivalent running time (Y _AT after temperature correction of the estimated _{, Esti)} and PV module surface temperature (the equivalent running time of the solar array on the basis of the T _m) of (Y _{a, Esti)} the estimated and the estimated PV equivalent running time (Y _a of the array _{, Esti} estimates the equivalent operating time (Y _{P, Esti} ) of the photovoltaic system _, the equivalent operating time (Y _{A, Esti} ) of the photovoltaic array and the equivalent operating time (Y) of the photovoltaic system _{P, Esti)} and compares the difference between the actual output value difference Calculating a value and if the difference value exceeds a predetermined reference, power generation performance estimator for estimating the power generation performance by re-calculating the coefficient model;
An estimation result display unit which displays information on the power generation performance estimation value and the output value of the solar power generation system according to a set period; And
And a memory for storing information about the collected operation data, the estimated value and the output value of the estimated result display unit.
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